Reinventing a Backyard

Turning a friend's yard into a Floral Harvest

I've been wanting to start growing larger quantities of flowers and greens so that I can use them in the floral designs I create for people. It's probably the most sustainable way to offer floral design.
My own yard is not quite as large as I would like, but my friend has more yard than she knows what to do with, so guess who's going to use the space? Yes, I've been offered a large plot in her yard. It gets full sun, to part sun in one corner. There is probably a good 500 square foot area that could be used.
It will take quite a bit of preparation, weed-wacking, weed pulling, and leveling, but with a fair amount of work I anticipate a great outcome. I'm really excited to offer floral materials that I know for a fact have not been sprayed with pesticides and are contributing nothing but floral joy and oxygen to the planet. I hope to also include organic and native plants, as seeds these days are everything from genetically modified to patented, by large companies like Monsanto and other massive monopolies.
I want to update you all every few weeks with the progress of the backyard flower garden. Here is the yard as it stands today:
I haven't decided on the exact flowers that I want to plant in the space, but I have illustrated how I want the outlook /landscape of the space to look. I know I want to include some sage, celosia, lavender, horsetails and ferns. Feel free and give me some flower/plant ideas if you have them:
Check in next week to see how far I've gotten with the space... I'm hoping to get it cleared this weekend.
G&G